This is how I explain it to Cis Men
Hey, let's say I took a car, right? Now let's also say I took that car and I stripped it down to the subframe, I reinforced it real well, and then I put a truck frame, and a truck body on it. I even gave it truck suspension and big old truck tires! To top it off I put a shiny new diesel engine in that son' bitch.
From every angle it looks like a truck, when people see me go by they say "Hey! Nice truck!" Hell it even functions like a truck, I can haul stuff with it and it has tons of towing capacity! Even the DMV and my insurance make me register it as a truck. Do you understand how crazy you sound by loudly insisting that it is in fact, still a car?
Is it a perfect analogy? No, but it does get them thinking in the right direction. Have you any other methods you have found to work?